Opposite sides of a parallelogram are congruent.

The diagonals of a parallelogram bisect each other.

Consecutive angles in a parallelogram are supplementary.

Opposite angles of a parallelogram are supplementary.

If a parallelogram is a rectangle, then the diagonals are congruent.

If aparallelogram has one right angle, it has four right angles.

The diagonals of a rhombus are perpendicular.

Both pairs of base angles of an isosceles trapezoid are congruent.

Each diagonal of a rhombus bisects a pair of opposite angles.

If the diagonals of a parallelogram are perpendicular, then the parallelogram is a rhombus.

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